Table 2

Distribution of Modified Columbia Scale scores examined by group and time period.


Baseline
 Study End (3 months)
 % change
 Unpaired t test (df = 67)
 Paired t test (df = 22)
 Paired t test (df = 45)
 Unpaired t test (df = 67)
Item No.
 Description
 Control (n = 23)
 Intervention (n = 46)
 Control (n = 23)
 Intervention (n = 46)
 Control
 Intervention
 Baseline comparison
 Control change
 Intervention change
 3 month comparison




mean (SD)
 mean (SD)
 mean (SD)
 mean (SD)

t statistic
 t statistic
 t statistic
 t statistic
1
 Fatigue/tiring easily?
 2.9 (0.9)
 2.9 (1.1)
 2.7 (1.1)
 2.1 (1.0)
 7.6
 26.9
 -0.16
 0.93
 4.04**
 1.76
2
 Trouble concentrating
 2.5 (1.1)
 2.9 (1.2)
 2.5 (0.9)
 1.8 (0.9)
 1.7
 36.8
 -1.23
 0.21
 5.84**
 3.46*
3
 Physical clumsiness?
 2.0 (1.1)
 1.7 (1.0)
 1.6 (0.6)
 1.5 (0.9)
 21.7
 13.7
 1.02
 1.93
 1.48
 -0.70
4
 Decreased daytime alertness?
 2.7 (1.1)
 2.5 (1.2)
 2.1 (0.8)
 1.8 (0.8)
 21.0
 28.1
 0.74
 2.73
 3.96**
 0.45
5
 Trouble with memory?
 2.4 (1.3)
 1.9 (1.1)
 2.1 (0.8)
 1.5 (0.7)
 12.5
 21.3
 1.65
 1.07
 2.80
 0.38
6
 General feelings of weakness
 2.0 (1.1)
 2.0 (1.0)
 1.7 (0.7)
 1.4 (0.8)
 17.0
 26.7
 0.33
 1.56
 3.60*
 0.67
7
 Light-headed & dizzy
 2.2 (1.4)
 2.1 (1.3)
 2.0 (1.1)
 1.4 (0.8)
 9.8
 33.7
 0.26
 1.10
 4.04**
 1.74
8
 Lethargy/sluggish feelings?
 3.0 (1.0)
 2.7 (1.3)
 2.3 (0.8)
 1.8 (0.8)
 23.5
 31.7
 0.93
 3.43*
 5.07**
 0.55
9
 Sleepiness in day
 3.0 (1.2)
 2.8 (1.2)
 2.6 (1.0)
 1.9 (0.7)
 14.5
 31.0
 0.66
 2.47
 4.90**
 1.55
10
 Work performance
 7.0 (1.7)
 6.4 (1.5)
 7.3 (1.6)
 7.6 (1.4)
 4.4
 19.4
 1.45
 -1.16
 -6.07**
 -2.72
11
 Alertness and concentration
 6.2 (1.8)
 6.1 (1.9)
 6.8 (1.7)
 7.5 (1.8)
 9.9
 22.9
 0.23
 -2.13
 -4.34**
 -1.57

Combined Score (first 9 items)
 22.7 (7.5)
 21.5 (8.3)
 19.5 (5.2)
 15.4 (5.7)
 14.3
 28.6
 0.59
 2.60
 5.22**
 1.53

* = p < 0.05, ** = p < 0.001 equivalent after applying Bonferroni correction

Mills et al. Journal of Circadian Rhythms 2007 5:2   doi:10.1186/1740-3391-5-2